Is he, since he doesn't have to be?

I don't think so. Hes a bit in shape but not buff
 
It is a bit strange since he drinks and is a spoiled brat but in the comic world you can eat, drink and be a spoiled brat without gaining a pound.

He is fairly muscular but nothing like Batman etc. ( kind of also depends on who's drawing him :) but Tony isn't extremely muscular like Batman, Captain America, etc. )
And as said; he doesn't have to be, especially now with the Extremis which enhances his entire body, thus his strength too.

He isn't a buff guy, but he is physically fit, I think Cpt. America gave him some h2h combat lessons too

Not for superhero standards no. He's muscled though.
 

Not exactly buff, just physically fit (not like he needs too much muscle anyways)

" I don't think so. Hes a bit in shape but not buff  It is a bit strange since he drinks and is a spoiled brat but in the comic world you can eat, drink and be a spoiled brat without gaining a pound. "

He would have to be in good shape, just like any pilot, as he has to withstand serious g-forces as he flies. Also, he does training for combat. He just isn't a body-builder or anything like that. 

no, he's all messed up.

" He isn't a buff guy, but he is physically fit, I think Cpt. America gave him some h2h combat lessons too "

Tony was never out of shape...not even when he was an alcoholic.

Yeah, but even then he happened to be a superhero who was phisically active.  This never really changed... 
 
Before that, well he was a young man who stayed in shape...  
 
Im not sure there is much to this.  Im just saying that the whole  ''Tony Stark is a drunk" thing has been old for decades now...

Lead by example:A story.

Suddenly

Then what happened?

During the Bob and Dave run, Stark was extremely pumped. We're talking Conan or bigger. And no, I'm not exxagerating, take a look at some of the art when Tony would do things like jogging topless during the Bob and Dave run. He was frikken HUGE! Really musclebound.

" @G'bandit:     Yeah, that’s a massive oversimplification of everything.  Stark's role in the implementation of the SHRA is overestimated.  The guy fought it tooth and nail in courts while others stayed on the sidelines, heck; he even hired criminals to prove a point in front of the Congress.  The bill was not his invention, he was its main legal opponent.  He just saw (and rightfully so) that there are legal ways to fight a bill.  It was a rational that was picked up by She-Hulk among others.  Saying that its all his fault is ridiculous, especially when you consider that the bill was massively popular among the population.  As for Spidey, you just avoid mentioning that he’s the one who left Tony and then act surprised when Stark decided to stop someone from obtaining his tech to use against him.  Big surprise considering that fighting unwanted appropriation of his designs is one of Stark's main defining features since... well ever!      Not to mention that the underhanded tactics of that conflict where not exclusive to Stark.  Just think of the two major fights of the war, during which, on both occasions, Cap started beating on Stark in a suit that was just as deactivated as Spidey's suit (heck, he was trying to kill Iron Man and was only stopped by an angry populace who was siding with the eeeeevil Tony Stark).  But no one will ever bash on Cap over this since he can do pretty much anything he feels like and he will be raised as a paragon of morality.   What about Spidey, who was so obsessed with winning that he was actually baffled when he saw the damage his little rebellion had caused at the end of the war?   Iron Man is a practical scapegoat.  Right now, he is the only person who is still held accountable over the Civil War.  Everyone else either gets a pardon because people assume they were mischaracterized or people simply forget their entire participation because they were not technically as high ranked as Iron Man was.    Now that its over and buried, stop using that corpse on every single debate on Shellhead.   The guy has huge issues, but to see him as Satan and to state that he can't possibly be in good shape because of those issues (which is no longuer true since the 80s) is getting really old. "

Fix

(Fix)

"@G'bandit:     Yeah, that’s a massive oversimplification of everything.  Stark's role in the implementation of the SHRA is overestimated.  The guy fought it tooth and nail in courts while others stayed on the sidelines, heck; he even hired criminals to prove a point in front of the Congress.  The bill was not his invention, he was its main legal opponent.  He just saw (and rightfully so) that there are legal ways to fight a bill.  It was a rational that was picked up by She-Hulk among others.  Saying that its all his fault is ridiculous, especially when you consider that the bill was massively popular among the population.  As for Spidey, you just avoid mentioning that he’s the one who left Tony and then act surprised when Stark decided to stop someone from obtaining his tech to use against him.  Big surprise considering that fighting unwanted appropriation of his designs is one of Stark's main defining features since... well ever!     Not to mention that the underhanded tactics of that conflict where not exclusive to Stark.  Just think of the two major fights of the war, during which, on both occasions, Cap started beating on Stark in a suit that was just as deactivated as Spidey's suit (heck, he was trying to kill Iron Man and was only stopped by an angry populace who was siding with the eeeeevil Tony Stark).  But no one will ever bash on Cap over this since he can do pretty much anything he feels like and he will be raised as a paragon of morality.   What about Spidey, who was so obsessed with winning that he was actually baffled when he saw the damage his little rebellion had caused at the end of the war?  Iron Man is a practical scapegoat.  Right now, he is the only person who is still held accountable over the Civil War.  Everyone else either gets a pardon because people assume they were mischaracterized or people simply forget their entire participation because they were not technically as high ranked as Iron Man was.    Now that its over and buried, stop using that corpse on every single debate on Shellhead.   The guy has huge issues, but to see him as Satan and to state that he can't possibly be in good shape because of those issues (which is no longuer true since the 80s) is getting really old. "

"Iron Man and Green Lantern  2 superheroes that have no reason to have bowflex bodies, but do anyway. "